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由 Eric Blake 提交于
If we are careful to handle 0-length read requests correctly, we can optimize our sparse read to send the NBD_REPLY_FLAG_DONE bit on our last OFFSET_DATA or OFFSET_HOLE chunk rather than needing a separate chunk. Signed-off-by: NEric Blake <eblake@redhat.com> Message-Id: <20171107030912.23930-3-eblake@redhat.com> Reviewed-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
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